Fair Value Measurements, Valuation Techniques - Recurring Basis (Details) - Fair value, recurring [Member] $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2026 USD ($) $ / loan	Dec. 31, 2025 USD ($) $ / loan
Total Consumer [Member] \| Residential mortgage [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Servicing asset, fair value by fair value hierarchy level [Extensible Enumeration]	Fair value, inputs, level 3 [Member]	Fair value, inputs, level 3 [Member]
Mortgage servicing rights	$ 5,608	$ 5,696
Servicing asset, valuation technique [Extensible Enumeration]	Valuation technique, discounted cash flow [Member]	Valuation technique, discounted cash flow [Member]
Total Consumer [Member] \| Residential mortgage [Member] \| Measurement input, cost to service per loan [Member] \| Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Mortgage servicing rights, measurement input \| $ / loan	62	61
Total Consumer [Member] \| Residential mortgage [Member] \| Measurement input, cost to service per loan [Member] \| Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Mortgage servicing rights, measurement input \| $ / loan	434	446
Total Consumer [Member] \| Residential mortgage [Member] \| Measurement input, cost to service per loan [Member] \| Weighted average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Mortgage servicing rights, measurement input \| $ / loan	94	96
Total Consumer [Member] \| Residential mortgage [Member] \| Measurement input, discount rate [Member] \| Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Mortgage servicing rights, measurement input	0.090	0.088
Total Consumer [Member] \| Residential mortgage [Member] \| Measurement input, discount rate [Member] \| Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Mortgage servicing rights, measurement input	0.130	0.125
Total Consumer [Member] \| Residential mortgage [Member] \| Measurement input, discount rate [Member] \| Weighted average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Mortgage servicing rights, measurement input	0.093	0.091
Total Consumer [Member] \| Residential mortgage [Member] \| Measurement input, prepayment rate [Member] \| Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Mortgage servicing rights, measurement input	0.057	0.057
Total Consumer [Member] \| Residential mortgage [Member] \| Measurement input, prepayment rate [Member] \| Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Mortgage servicing rights, measurement input	0.238	0.230
Total Consumer [Member] \| Residential mortgage [Member] \| Measurement input, prepayment rate [Member] \| Weighted average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Mortgage servicing rights, measurement input	0.081	0.080
Fair value, inputs, level 3 [Member] \| Measurement input, cost to service per loan [Member] \| Minimum [Member] \| Non modified loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Mortgage servicing rights, measurement input \| $ / loan	62	61
Fair value, inputs, level 3 [Member] \| Measurement input, cost to service per loan [Member] \| Maximum [Member] \| Non modified loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Mortgage servicing rights, measurement input \| $ / loan	108	112
Fair value, inputs, level 3 [Member] \| Interest rate contracts [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Derivative asset (liability) net, valuation technique [Extensible Enumeration]	Valuation technique, discounted cash flow [Member]	Valuation technique, discounted cash flow [Member]
Fair value, inputs, level 3 [Member] \| Interest rate contracts [Member] \| Measurement input, discount rate [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Net derivative assets and (liabilities)	$ (270)	$ (139)
Fair value, inputs, level 3 [Member] \| Interest rate contracts [Member] \| Measurement input, discount rate [Member] \| Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Net derivative assets and (liabilities), measurement input	0.028	0.025
Fair value, inputs, level 3 [Member] \| Interest rate contracts [Member] \| Measurement input, discount rate [Member] \| Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Net derivative assets and (liabilities), measurement input	0.037	0.035
Fair value, inputs, level 3 [Member] \| Interest rate contracts [Member] \| Measurement input, discount rate [Member] \| Weighted average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Net derivative assets and (liabilities), measurement input	0.037	0.034
Fair value, inputs, level 3 [Member] \| Interest rate contracts [Member] \| Measurement input, default rate [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Net derivative assets and (liabilities)	$ (1)	$ (3)
Fair value, inputs, level 3 [Member] \| Interest rate contracts [Member] \| Measurement input, default rate [Member] \| Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Net derivative assets and (liabilities), measurement input	0.004	0.004
Fair value, inputs, level 3 [Member] \| Interest rate contracts [Member] \| Measurement input, default rate [Member] \| Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Net derivative assets and (liabilities), measurement input	0.120	0.120
Fair value, inputs, level 3 [Member] \| Interest rate contracts [Member] \| Measurement input, default rate [Member] \| Weighted average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Net derivative assets and (liabilities), measurement input	0.025	0.024
Fair value, inputs, level 3 [Member] \| Interest rate contracts [Member] \| Measurement input, loss severity [Member] \| Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Net derivative assets and (liabilities), measurement input	0.500	0.500
Fair value, inputs, level 3 [Member] \| Interest rate contracts [Member] \| Measurement input, loss severity [Member] \| Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Net derivative assets and (liabilities), measurement input	0.500	0.500
Fair value, inputs, level 3 [Member] \| Interest rate contracts [Member] \| Measurement input, loss severity [Member] \| Weighted average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Net derivative assets and (liabilities), measurement input	0.500	0.500
Fair value, inputs, level 3 [Member] \| Equity contracts [Member] \| Valuation technique, discounted cash flow [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Net derivative assets and (liabilities)	$ (397)	$ (579)
Fair value, inputs, level 3 [Member] \| Equity contracts [Member] \| Valuation technique, discounted cash flow [Member] \| Measurement input, conversion factor [Member] \| Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Net derivative assets and (liabilities), measurement input	(0.004)	(0.003)
Fair value, inputs, level 3 [Member] \| Equity contracts [Member] \| Valuation technique, discounted cash flow [Member] \| Measurement input, conversion factor [Member] \| Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Net derivative assets and (liabilities), measurement input	0.000	0.000
Fair value, inputs, level 3 [Member] \| Equity contracts [Member] \| Valuation technique, discounted cash flow [Member] \| Measurement input, conversion factor [Member] \| Weighted average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Net derivative assets and (liabilities), measurement input	(0.002)	(0.002)
Fair value, inputs, level 3 [Member] \| Equity contracts [Member] \| Valuation technique, discounted cash flow [Member] \| Measurement input, weighted average life [Member] \| Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Net derivative assets and (liabilities), term of contract	9 months 18 days	1 year
Fair value, inputs, level 3 [Member] \| Equity contracts [Member] \| Valuation technique, discounted cash flow [Member] \| Measurement input, weighted average life [Member] \| Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Net derivative assets and (liabilities), term of contract	3 years 9 months 18 days	4 years
Fair value, inputs, level 3 [Member] \| Equity contracts [Member] \| Valuation technique, discounted cash flow [Member] \| Measurement input, weighted average life [Member] \| Weighted average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Net derivative assets and (liabilities), term of contract	1 year 4 months 24 days	1 year 8 months 12 days
Fair value, inputs, level 3 [Member] \| Equity contracts [Member] \| Valuation technique, option model [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Net derivative assets and (liabilities)	$ (436)	$ (545)
Fair value, inputs, level 3 [Member] \| Equity contracts [Member] \| Valuation technique, option model [Member] \| Measurement input, correlation factor [Member] \| Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Net derivative assets and (liabilities), measurement input	(0.665)	(0.200)
Fair value, inputs, level 3 [Member] \| Equity contracts [Member] \| Valuation technique, option model [Member] \| Measurement input, correlation factor [Member] \| Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Net derivative assets and (liabilities), measurement input	0.980	0.985
Fair value, inputs, level 3 [Member] \| Equity contracts [Member] \| Valuation technique, option model [Member] \| Measurement input, correlation factor [Member] \| Weighted average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Net derivative assets and (liabilities), measurement input	0.660	0.771
Fair value, inputs, level 3 [Member] \| Equity contracts [Member] \| Valuation technique, option model [Member] \| Measurement input, volatility factor [Member] \| Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Net derivative assets and (liabilities), measurement input	0.138	0.080
Fair value, inputs, level 3 [Member] \| Equity contracts [Member] \| Valuation technique, option model [Member] \| Measurement input, volatility factor [Member] \| Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Net derivative assets and (liabilities), measurement input	1.159	1.050
Fair value, inputs, level 3 [Member] \| Equity contracts [Member] \| Valuation technique, option model [Member] \| Measurement input, volatility factor [Member] \| Weighted average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Net derivative assets and (liabilities), measurement input	0.481	0.427
Fair value, inputs, level 3 [Member] \| Total Consumer [Member] \| Residential mortgage [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Mortgage servicing rights	$ 5,608	$ 5,696

Value of input used to measure net derivative asset (liability).

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
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-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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Indicates valuation technique for measuring net derivative asset (liability).

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- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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- Definition

Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
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-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Indicates level within fair value hierarchy of servicing asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
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-Section 50
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-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

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Value of input used to measure servicing asset.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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Indicates valuation technique for measuring servicing asset.

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